NOW TestoJack 100 Review | Benefits | Ingredients | Side Effects |

NOW TestoJack 100 Testosterone Booster Review

NOW TestoJack 100 is a testosterone booster and libido enhancer. It contains LongJack extract, which is famous for its ability to raise male sex drive.

However, the product lacks a lot of important ingredients for testosterone, and it even contains some that come with negative side effects.

So all in all, is NOW TestoJack 100 worth the money? Let’s take a look at its benefits, side effects, and ingredients to find out!

Pros and Cons of NOW TestoJack 100


  • Uses LongJack Extract which boosts libido.


  • Contains a ZMA proprietary blend, you can’t tell the dosage of each individual ingredient.
  • Uses Tribulus which aggravates the prostate in some males.
  • Lack of key T-boosters, such as D-AA, D3, Fenugreek, and Red Panax Ginseng.


TestoJack by NOW is a male testosterone formula with the following benefit;

“Supports Enhanced Energy and Healthy Testosterone Levels in A Normal Range.” 

That’s quite an abstract description. We’ll need to look further into the product’s dosage and ingredients to determine its true benefits.

Dosage | How To Use

You’re instructed to take 2 capsules of NOW TestoJack 100 with food, once per day.

This isn’t an ideal way to dose a testosterone booster, mainly because it doesn’t offer you prolonged benefits.

With only 2 capsules and 1 serving, there’s not much you can get out of it. The reality is, you need 3-4 daily servings of a T-booster to keep your male hormone constantly topped up with beneficial ingredients.

With Now TestoJack 100, you’ll experience a short spike in testosterone, which will last a couple hours at most.

Unfortunately, in order to see any long-lasting benefits from testosterone boosters, you need to maintain your testosterone levels high at all times.


NOW TestoJack 100 contains a total of 6 ingredients.

In addition to the standard ZMA formula (Vitamin B6, Magnesium, and Zinc), we also have Tribulus Terrestris, Longjack Extract, and another ZMA combination, in a form of a proprietary blend.

The only ingredient that’s actually backed up by science here is Longjack Extract. It shows promise in raising libido. However, we don’t have enough evidence for it boosting testosterone yet.

While zinc, magnesium, and B6 are all great if you’re deficient in these vitamins and minerals, they can’t help you much without the aid of other important nutrients. Such as D3, D-Aspartic Acid, and Fenugreek.

At best, ZMA combination will improve your sleep quality – but don’t expect too much when it comes to raising testosterone levels.

Let’s take a closer look at the rest of the ingredients;

Ingredient Breakdown

ZMA Proprietary blend (Zinc, Magnesium, B6)

ZMA is always a good combo to see, but not as a part of a proprietary blend.

If you didn’t know, these blends hide the individual amount of each ingredient inside, only showing you their combined dosage.

It’s important to know the dosage of each ingredient, because that tells you how effective, and safe they are.

Tribulus Terrestris

Here comes the ugly Tribulus again. An herb long thought to possess great benefits for testosterone, but now it’s proven it has no benefits for the male hormone at all.

In fact, the only thing that Tribulus is good at is raising libido, but even that isn’t worth it since this ingredient also comes with a nasty side effect…

That side effect is an enlarged prostate.

That’s right, your prostate may get aggravated by taking Tribulus. So unless you’re willing to risk a visit to the doctor, avoid Tribulus at all costs.

LongJack (Eurycoma Longifolia Extract)

Okay, now LongJack is a great addition to any testosterone booster. While it may not be effective at raising the male hormone, it does increase libido – and it’s one of the best natural libido boosters out there.

It’s unfortunate that this nutrient isn’t accompanied by ingredients like Vitamin D3, D-Aspartic Acid, and Red Panax Ginseng.  Because that would really make a difference in your testosterone levels.

What Others Say

NOW TestoJack 100 Testosterone Booster Review

“From Nebraska, I’m 62 and into month 2 of taking these. I have 2 more month’s worth left, so I will finish them out, but I really have not been able to tell any difference.” – iHerb Customer 

“seems to start working after 10 days of use … Taste like Vitamins … Lots of GAS … but … not having to get up 5 times a night.” – iHerb Customer

“Have not noticed any visible effect. Have taken it for 2 consecutive months 1 x 2 tablets a day.” – jgorzko ( Customer)

Side Effects

Since NOW TestoJack contains Tribulus, it might cause negative side effects in some men.

Also, there’s a risk with a ZMA proprietary blend, because high doses of zinc can cause numerous side effects. We don’t know the dosage of the zinc in this blend.

The potential side effects of NOW TestoJack 100:

  • Enlarged prostate
  • Nausea
  • Stomach Pain
  • Vomiting

Conclusion to NOW TestoJack 100

NOW TestoJack 100 is a disappointing product. The only ingredient that’s worth mentioning here is LongJack, which is great if you’re looking to boost libido.

Other than that, we have ZMA proprietary blend which hides its dosage from you, along Terrestris which is shown to be dangerous for your prostate.

If you’re serious about raising your testosterone, then you need to look for products that contain proven and safe ingredients. You can check our top 3 T-boosters right here.

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Testosterone Guides and Articles

At MaleTestosteroneBooster, it’s our aim to help you get the most out of your life by helping you boost your testosterone levels. We all know what it’s like to feel suboptimal in the bedroom, the gym, and in everyday life when your confidence is lacking. This is why I’ve put together the below guides to help you reach your goals! Why not check them out, you may find just what you’re looking for.


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